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Difference between revisions of "NVGate Formula Computation"
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If you want to recompute this value using the FFT spectrum line you need to do the following computation: | If you want to recompute this value using the FFT spectrum line you need to do the following computation: | ||
First you have to sum the amplitude of the frequency line between the freq min and the freq max A(f). (be careful if you have RMS value you have to put each amplitude to square before sum it. A(f)² ). Then you have to devide that by the ENBW of the ponderation windows (for information it’s 1.5 for haning windows.) then do the square root of this sum. | First you have to sum the amplitude of the frequency line between the freq min and the freq max A(f). (be careful if you have RMS value you have to put each amplitude to square before sum it. (A(f)² ). Then you have to devide that by the ENBW of the ponderation windows (for information it’s 1.5 for haning windows.) then do the square root of this sum. | ||
That is to say: | That is to say: | ||